Chuck.



No. 8C2-,412. PATBNTED OCT. 2, 1906. W. I. PARSONS. CHUCK.

- I APPLICATION FILED MIMI. 1906.

= UNITED STATES PATENT OFFICE.

WILLTAM J. PARSONS, CF MONTAGUE, MASSACHUSETTS, ASSIGNCR To MILLERS FALLS COMPANY, or MILLERS FALLS, MASSACHUSETTS, ACCRPORATION CF MASSACHUSETTS.

CHUCK.

Speeication of Letters Patent.

Appiiason ned March 21, 1906. serial no. 307,212?,V

.To all whom/ t may concern,.- i

Be it knownthat I, WILLIAM J PARSONS,y e, `1n the county of Franklin and of Monta State of assachusetts, have invented certain new and 'ufseul Improvements in Chucks, of which the following-is a specification.

This invention relates to chucks, such as' are used for holding tools-such'as augers,

taper, or cylindrical or other formed which are not tapered.

The invention'consists inthe improvements which I'will now'p'rocee'd to describe and ,cjamih j f t eaccom anying drawings iormingal 'part-of this speclication, Fi relire resents alongitudinal section'of a c uck em' odymg my invention, the chuck-j aws lbeing-in their- .inoperative position. Fig.' 2 .represents `a view-similar to Fig. 1, showing the jaws vclosed upon the tapered shank of a tool'. Fi 3 rep# shank beingv omitted@ Fig. '4 represents aV view similar-to Fig. 2, showing the jawsengaged with a cylindrical shank which `is not tapered. Fig. 5 represents a section on line 5 5 ofFi 2. Fig. 6 representsv a s ection on line 6'6 o Fig. 4. Fig. 7l represents a section on line 7 7 of Fig. 1. Fig. 8` represents a section on line 8 8 of Fig. 1. Fig. 9 represents a perspective view o oneof the outer jaws and theinner jaw flexibly. connected therewith. The same numerals ofreference indicate the same parts in allthe, figures.

'In vthe drawings, 12-'lrepresentsza head' with a bit-brace or other suitable'holder.

head 12 is of cylindrical form, and. its exime-.

the portion ofthe tool.

thread being adapted 'to engage an; intern l rpering internal surface .-16 adaptedteieopl crate with tapered faces on' the 'outer' jaws,A hereinafter described, to Aforce thev said jaws. together after the-sleevejis turnedtogniqve it grasp Va tool-shank 18 ande-.withl tap'eredfexternal faces 19,l which Aare-zin; Contact vided withsh'anks 20,' whicl1` project inwardly into the slot 13 ofthe head', the sides of their ends being loosely engaged with the-head-at,

'adapted' to tip or swing freelyf-to permit a free movement of the 'jj aws vvtoward and from eachother.` 1 Means'v are'. referably provided yieldi engagementlwith the tapered .internal 'su ace f the-.c10sing`s1eeve 115 when the latter is "retracted". as shown-in Fig. 1, the said means in, this embodiment' of the inventioi comprising a vspring2 1,located in a cavity formed inthe mn'erxp'ortionof thehead 12,- anda plunger 22,su vported yieldingly by 'the spring, the' .`shan11i)s 221)' bein provided withvoifset inner ends 23, the .enl s of which bear upon the plunger22', as clearly shown in Figs. 1, 2, and 4. l

v24 24 represent inner jaws which are flexibly connected with the outer jaws 17 by means of links 25 25, vpivoted at 26 to the outer jaws and at 27 to theinner jaws. The inner faces of the inner jaws are groovedto form biting or shankengaging angles similar to those o'f'the'jaws1`7..

28 represents all. abutment lrigidly aixed by a screw 29 o r otherfsuitable means to the head 12' Within-tl1e slot `13, vthesaidl abutment being betwtreen'thev innerand outer ends of theslot and being` recessed on its `outer side to form 'inclined guides 30 80, adapted to cooperate with inclined or beveled faces31 31, 'formed on, thel inner ends of the inner jaws 24 24. The inner jaws are enabled by their thread formed in a jaw-closing sleeve '15,1' the j'f' outer end of which is contracted and has. ztta'f-- -17 17 'represent'I two cute JaWSWhiCh'laIa provided with grooved inner surfaeesforme" j ing, bitingl or j grasping anglesv adapted. to 65 with the .taperedinternalsurface 1 6`of .the jaw-closingcollar155,;-Thejawsl] are'pr l the inner portion ofthe slot, sothat .they are roo through the links 25 to stand at an angle with the outer jaws, so that the outer and innerjaws may simultaneously engage a cylindrical shank portion which is not tapered and a taperedshank portion at the inner end of the cylindrical portion, as shown in Fig. 2. The said flexible connection also enables the inner jaws to stand in alinement with the outer jawsso that both the outer and inner jaws may grasp a cylindrical shank portion .which isfof uniform diameter along the entire portion engaged by the jaws, as shown.

in Fig. 4.

When the jaw-closing sleeve 15 is moved outwardly, as shown inFig .1, the outer jaws, 17 are projected by the spring 21, lthe inner jaws, which are supported by the outer jaws, being correspondingly projected. The jaws are now opened so that a tool-shank may be freely inserted between them until it comes to a 'bearing on the abutment 28, the inner jaws` being swung yieldingly inward by means of springs 32, the'outer ends of which are affixed to the outer jaws, said springs bearing against the outer surfaces of the inner jaws. When aftool-shank is inserted between the jaws, the inner jaws yield to perysaid jaws enabling the shank-grasping surfaces of the jaws to conform to the shape of the tool-shank whether the same be partly cylindrical and partly tapering, as shown in Fig. 2, or wholly cylindrical, as shown in Fig. 4, the jaws being also-adaptable to tapering Shanks of various tapers and proportionsthat is to say, the ta ered portion of the shank may be of such ength that it will be j grasped by both the outer and the inner jaws.

It 4will be seen from the foregoing that the two series of jaws fiexibly connected as described and therefore conformable to a wide range of variety in the form of'tool-shanks enable any shank to be lirmly engaged and held whether the'shank be of tapering form or of' uniform size along. its jaw-engaging portion.

It is obvious'that the inner jaws 24 are independent inl their gripping action of the outer jaws 17, the outer jaws and their Shanks 20 being holders or supports for the inner Aj aws.

I claim- 1. A `chuck comprising a slotted head, outer jaws having tool-engaging faces and loosely supported by the head, inner jaws ing positions with their acting faces eitherparallel or tapering relatively to each other and to the faces of the outer jaw, and means for simultaneously contracting the outer and inner jaws.

3. A chuck comprising a slotted head, A

outer jaws having Shanks loosely engaged with the head within the slot thereof, links pivoted to the outer jaws and extending inwardly therefrom, inner jaws pivoted to the inner portions of the links, and means for simultaneously contracting the outer and inv ner jaws.

4. A chuck comprising a slotted head, having an abutment provided with fixed inclined guides within the slot, outer jaws having shanks extending inwardly beyond the abutment, and loosely engaged with the head, inner jaws flexibly connected with the outer jaws, and adapted to coperate with said inclined guides, and means for simultaneously closing and longitudinally moving the outer jaws, the longitudinal movement of said jaws being imparted, through the flexible connection, to-the inner jaws, and causing the closing of the inner jaws by the said guides.

5. A chuck comprising a slotted head, outer jaws loosely engaged with the head, yielding means for projecting said jaws longitudinally of the head, vinner jaws flexibly connected with the outer jaws, means for sivmultaneously closingv and longitudinally moving the outer jaws, the longitudinal movement of said jaws being imparted, through the flexible connection, tothe inner jaws, and means for inwardly guiding or deecting the inner jaws. 1

6.v A chuck comprising a slotted, externally-threaded head, having an .abutment provided with inclined guides, outer jaws oosely engaged with the head, yielding means for projecting said outer jaws longitudinally of the head, inner jawsilexibly connected with the outer jaws, and adapted to bear at their inner ends on said guides, and an"internallythreaded sleeve engaging the external thread of the head, and provided with a tapered inner surface engaging the outer jaws, said sleeve being adapted to simultaneously close and longitudinall move the outer jaws, and cause the incline 'guides to close the inner aws.

7. A chucll: comprising a,slotted, exter- I holders,v means for simultaneously forcing zo nally-thieaded head, having'uanf abutment within the slot, saidabutmeht being sepa-y rated by a space from the 'inner end of the slot, and provided with inclined'fguides, outer jaws having shanks extending into the slot at opposite sides of the abutment, said shan having offset inner ends projectinginto the said space, means for exerting yield` ing outward'pressure on said oHset ends,- inner ljaws iiexibly connected with the outer j aws and adapted to bear at their inner ends Qn `said guides, and an internally-threaded sleeve engaging the .external threadof the head, and provided with a tapered inner surface, engaging the outer jaws. j

`8. A chuck comprising a slotted head, jawholders loosely supported by the head, jaws flexibly connected withand supported by the the jaw-holders longitudinally and laterally inward, and jaw-closing means coperating with the inner end portions of the jaws.

9. A chuck, comprising a slotted head, jawholders loosely supported by the head, jaws flexibly-connected with and supported by the holders', means for vsimultaneously forcing the jaw-holders longitudinally and laterally inward, means for yieldingly pressing the jaw-holders longitudinally outward, andiixed j aw-closing guides coperating with the inner ends of the jaws.

In testimony whereof I have affixed my signature in presence of two witnesses.

. WILLIAM J. PARSONS. Witnesses:

WM. G. STEBBINS, LizziE STRACHAN. 

